Fluid-pressure brake.



PATENTED MAY 7, 1907.

w. H. SAUVAGE.

FLUID PRESSURE BRAKE.

APPLIOATION FILED NOV. 21, 1906.

v w 9% 0 0 v Q 7 x a? A WM $1 i \Q y NW mwml 4Q. 0%N0 WN M. WK 9% Y IMNI\Q I; 0 Q m @M Q 1 g I Wm NW Q -HTAQIIIQ o L w Q: A l m 0 0 4 x QM QM vw UNITED STATES EX TENT OFFTGE.

WILLIAM H. SAUVAGE, OF NEW YORK, N. Y., ASSIGNOR TO SAUVAGE SAFETY BRAKECOMPANY, A CORPORATION OF NEW JERSEY.

FLUID-PRESSURE BRAKE.

Patented May 7, 1907.

A li ati fil d November 21, 1906. fierial No. 344,439.

To aZZ whom it may concern Be it known that 1, WILLIAM H. SAUVAGE, acitizen of the United States of America, and a resident of the boroughof Manhattan, city, county, and State of New York, have in ventedcertain new and useful Improvements in Fluid-Pressure Brakes, of whichthe following is a specification.

The invention disclosed comprises certain improvements on that shown inmy reissued Letters Patent No. 12,229 dated June 7th, 1904.

The best form of apparatus embodying my invention at present known to meis illusshows a plan view of a portion of the usual freight car brakeapparatus with my invention applied thereto, parts being broken away andthe brakes shown in release position.

Throughout the drawing, like reference figures indicate like parts.

1 is the auxiliary reservoir, 2 the usual cylinder having piston 4,hollow piston rod 6, push rod 11 and spring 32. One brake lever 8 isshown with a portion of tie rod 9 and of one top rod 10.

3 is a second or auxiliary cylinder having piston 5, hollow piston rod7, spring 33 andpush rod 12.

13 is a port in the side wall of cylinder 2 and so located as to beuncovered by piston 4 when it has traveled about 53,; inches.

14 is a port in the pressure head 15 of cylinder 3, connected to port 13by pipe 16.

18 is a lever pivoted to a fixed fulcrum 19 on the car body at one. endand at the other end to the push rod 12 by pin 22. The link 21 connectslever 18 with the brake rigging. A friction clutch composed of theclutch dog 24 perforated for the passage of the push rod 12 and havingthe fulcrum projection 25 is held in position by spiral spring 26mounted on rod 12 and compressed between the dog and the yoke 20connected to the hollow piston by bolts 23. This forms a gripping deviceconnecting the second piston to the brake rigging.

27 is the outer end or tail of the clutch dog 24 which is engaged by thecollar 29 on piston 4. To prevent the parts being jammed in case theclutch v24 should slip and allow the second piston to have enough travelto cause the extension 27 of dog 24 to overtake and strike the collar 29on the out trated in the accompanying drawing which stroke, I employsome suitable stop for the piston. Bolts, 34, 34 inserted through thewalls of the second cylinder will serve for the purpose or any otherdevice that blocks the second piston after it has traveled apredetermined distance, say 6 inches.

The rod 31 may extend to the hand brake apparatus.

rigging operate in the usual manner. The push rod 12 moves freelythrough the clutch on the out stroke of the first piston 4. When piston4 passes port 13, air passes through pipe 16 to cylinder 3 and forcespiston 5 out. This piston being connected to the brake rigging throughpush rod 12, lever 18, link 21. and clutch dog 24 as soon as the collar29 of piston 4 moves away from the extension 27 of dog 24, adds itsforce with double effect to the tension of the brake rigging. When theair is exhausted from the cylinders, piston 5 first comes home. Thebrakes are held in the position then assumed until piston 4 goes homewhen its collar 29 strikes the tail 27 of dog 24 and trips the clutchpermitting the push rods also to come home and release the brakes. Ifind this slightly delayed final release an advantage on long trains asit tends to permit the cars to adjust themselves relative to one anotherbefore the brakes are completely released and so avoid breaking thetrain in two when releasing long trains at slow speeds.

The apparatus disclosed is particularly advantageous in its action inapplying brakes in that the first cylinder applies the brakes quicklybut without great force as the air is bled off into the second cylinder.The latter puts on the maximum brake pressure after a delay of afraction of a second, thus avoiding the heavy blow of the ordinarysingle cylinder application. Also in case of much slack existing in thebrake rigging as through wear of the brake shoes, the first piston goesnearly to the limit of its travel before sufficient air gets into thesecond cylinder to start the second piston into action. The result isthat the travel of the second piston rarely exceeds 3. inches eventhough the first piston goes the whole length of its cylinder whichgives it a travel of 12 inches.

Of course other forms of gripping devices or clutches could be used andother arrangements of levers, and the tripping connection in operationthe first cylinder and brake,

' having a hollow piston rod, brake ri ging and push rod connectedthereto, of a se hond cylinder, piston with hollow piston rod and pushrod also connected to the brake rigging, a gripping device mounted onthe second diston rod and normally preventing the movement of the secondpush rod into the hollow piston rod but permitting it to be withdrawntherefrom, and means for tripping said gripping device actuated by thefirst piston.

2. In a fluid pressure brake apparatus, the combination with the usualcylinder, piston having a hollow piston. rod, brake rigging and push rodconnected thereto, of a second cylinder, piston with hollow piston rodand push rod also connected to the brake rigging, a gripping devicemounted on the second piston rod and normally preventing the move mentof the second push rod into the hollowpiston rod but permitting it to bewithdrawn therefrom, and means for tripping said gripping deviceactuated by the first piston, said gripping device comprising aperforated friction dog encircling the second push rod, fulcrumed on thesecond piston and having an extension engaged by the first piston,

3. In a fluid pressure brake apparatus, the combination with the usualcylinder, piston having a hollow piston rod, brake rigging and pushrod-connected thereto, of a second cylinder, piston with hollow pistonrod and push rod also connected to the brake rigging, a gripping devicemounted on the second piston rod and normally preventing the movement ofthe second push rod into the hollow piston rod but permitting it to bewithdrawn therefrom, and means for tripping said gripping deviceactuated by the first piston, said gripping device comprising aperforated friction dog encircling the second push rod, fulcrumed on thesecond piston and having an extension engaged by the first piston,together with a yoke carried by said second piston and a spiral springsurrounding the push rod and confined between the yoke and the clutchdog.

4. In a fluid pressure brake apparatus, the usual cylinder, pistonhaving a hollow piston rod, brake rigging and push rod connectedthereto, the push rod telescoping into the hollow piston rod, incombination with a second cylinder, piston with hollow piston rod andpush rod telescoping therein and also connected to the brake rigging bya system of levers, means actuated by the movement of the first pistonadmitting air to the second cylinder, a clutch mounted on the secondpiston rod, and engaging the second push rod, and means for trippingsaid clutch operated by the first piston.

5. In a fluid pressure brake apparatus, the usual cylinder, pistonhaving a hollow piston rod, brake rigging and push rod connectedthereto, the push rod telescoping into the hollow piston rod, incombination with a second cylinder, piston with hollow piston rod andpush rod telescoping therein and also connected to the brake riggin byasystem of levers, means actuated by the movement of the first pistonadmitting air to the second cylinder, a clutch mounted on the secondpiston rod, and engaging the second push rod, and means for trippingsaid clutch operated by the first piston, said means comprising anextension of the clutch dog engaged by a projection on the first hollowpiston rod.

6. In a fluid pressure brake apparatus, the combination with the usualcylinder, piston having a hollow piston rod, brake rigging and push rodconnected thereto, of a second cylinder, piston with hollow piston rodand push rod also connected to the brake rigging, a gripping devicemounted on the second piston rod and normally preventing the movement ofthe second push rod into the hollow piston rod, but permitting it to bewithdrawn therefrom, and means for tripping said gripping deviceactuated by the first piston, together with means for limiting theoutward stroke of the second piston at a point beyond which areengagement between the gripping and tripping devices might occur.

7. In a fluid pressure brake apparatus, the combination with the usualcylinder, piston having a hollow piston rod, brake rigging and push rodconnected thereto, of a second cylinder, piston with hollow piston rodand push rod also connected to the brake rigging, a gripping devicemounted on the second piston rod and normally preventing the movement ofthe second push rod into the hollow piston rod but permitting it to bewithdrawn therefrom, and means for tripping said gripping deviceactuated by the first piston, said gripping device comprising aperforated friction dog encircling the second push rod, fulcrumed on thesecond piston and having an extension engaged by the first piston, together with a stop limiting the movement of the second piston.

Signed at New York, N. Y. this 19th day of November, 1906.

WILLIAM H. SAUVAGE.

Witnesses:

A. PARKER-SMITH, M. G. CRAWFORD.

